We will test the effect of a serious game that aims to improve lifestyle (e.g., eating behaviour, exercise) behaviour of young children. We will test children in primary school, group 4-8, during school time. Half of the children will play the game and subsequently we will assess certain measurements (e.g., attitudes towards food types, food intake, attitude towards the game). Subsequently, children can play the game for two additional weeks. After two weeks we will assess identical measurements to see possible differences.